<?php
/**
 *
 *
 * @copyright Copyright (c) Beijing Jinritemai Technology Co.,Ltd.
 */

namespace General\Db\Sql;

interface ExpressionInterface
{
    const TYPE_IDENTIFIER = 'identifier';
    const TYPE_VALUE = 'value';
    const TYPE_LITERAL = 'literal';

    /**
     * @abstract
     * @return array of array|string should return an array in the format:
     * array (
     *    // a sprintf formatted string
     *    string $specification,
     *    // the values for the above sprintf formatted string
     *    array $values,
     *    // an array of equal length of the $values array, with either TYPE_IDENTIFIER or TYPE_VALUE for each value
     *    array $types,
     * )

     */
    public function getExpressionData();
}
